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Sample Technical Questions

C Sample Question

  1. struct point
     {
     int x;
     int y;
     };
    struct point origin,*pp;
    main()
    {
    pp=&origin;
    printf("origin is(%d%d)\n",(*pp).x,(*pp).y);
    printf("origin is (%d%d)\n",pp->x,pp->y);
    } 

    Answer:

    origin is(0,0)
    origin is(0,0)

    Explanation:

    pp is a pointer to structure. we can access the elements of the structure either with arrow mark or with indirection operator.

    Note:

    Since structure point is globally declared x & y are initialized as zeroes
  2. main()
    {
     int i=_l_abc(10);
     	 printf("%d\n",--i);
    }
    int _l_abc(int i)
    {
     return(i++);
    }

    Answer:

    9

    Explanation:

    return(i++) it will first return i and then increments. i.e. 10 will be returned.
  3. main()
    {
     char *p;
     int *q;
     long *r;
     p=q=r=0;
     p++;
     q++;
     r++;
     printf("%p...%p...%p",p,q,r);
    }

    Answer:

    0001...0002...0004

    Explanation:

    ++ operator when applied to pointers increments address according to their corresponding data-types.
  4. main()
    {
     char c=' ',x,convert(z);
     getc(c);
     if((c>='a') && (c<='z'))
     x=convert(c);
     printf("%c",x);
    }
    convert(z)
    {
      return z-32;
    }

    Answer:

    Compiler error

    Explanation:

    declaration of convert and format of getc() are wrong.
  5. main(int argc, char **argv)
    {
     printf("enter the character");
     getchar();
     sum(argv[1],argv[2]);
    }
    sum(num1,num2)
    int num1,num2;
    {
     return num1+num2;
    }

    Answer:

    Compiler error.

    Explanation:

    argv[1] & argv[2] are strings. They are passed to the function sum without converting it to integer values.

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